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I have a 2 year old GE JTP86 Microwave/Con. oven combo which worked just fine until the other night when I was baking at 400F and used the micro to melt some butter for 30 seconds. The next thing I know is that there is no power to the micro, oven still operating fine. I noticed that the inside of the Micro was very hot. I researched online through this site and others which told me to check fuse and tco's. I opened up the front button panel for access, the fuse checked out OK and I froze the tco located behind the button panel with the blue wires going to it. When I put the fuse and tco back in the power was on and everything seemed to work fine until I found that the MW was not heating anything up. This unit should be under 5 year warranty but due to my position on hte planet there are no GE repair centers near here. Home Depot told me I was on my own so I called a repair man who just got finished...he told me to replace the magnetron, capacitor, mag tco and the transformer...this seems a bit excessive and I told him it doesn't fix what may have been the original problem of the MW getting to hot and blowing out sensors. He said he tested the transformer and it was only putting out about 3 volts and he said the magnetron tco checked out ok. I read here elsewhere that the problem should lie in the magnetron. How do figure this out? Bob

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  • bob5662 Sep 03, 2010

    Thanks for the quick reply and manual, this seems to be a different model than mine, but looks like most parts are the same.

  • bob5662 Sep 03, 2010

    After looking at the schematic, this is quite a bit different than my model, do you have one for PT970SM1SS? Mine is not an Advantium, which seems to be a combo MW/Convection oven. Mine is a microwave on top with a convection oven on the bottom. Similar to thishttp://www.google.com/products/catalog?q... PT970

  • bob5662 Sep 03, 2010

    Thanks for the cool video! I definitely could take that repair guys job away from him now...I did request a manual from the site you suggested also. The fan seemed clean enough, will check again. Appreciate the help, will keep on this until fixed.

  • bob5662 Sep 03, 2010

    After watching the video again, a few questions.
    1. My main worry here is to repair the MW so it works again and then have the original problem happen again, which seemed to be the interior of MW getting too hot and tripping the at least one tco and maybe frying a couple of other parts that still need to be determined. What would cause the microwave to get hot from the oven down below? We used the oven last night and the MW was as cool as could be.
    2. How do you test the transformer and magnetron?
    3. This repair guy who was here today really didn't seem to know much about troubleshooting, he basically said I should replace ALL the main parts. I don't think he checked the diode which I will check tomorrow, could one of the other tco's be causing the magnetron not to work? Like the magnetron tco?

  • bob5662 Sep 03, 2010

    Thanks for the detailed reply Ginko, I will check these items you pointed out. It may take me a day or so as I need some help to slide the unit out of the cabinet. Other than that I should be able to check and repair this competently and safely. I'll let you know what I find.
    I had the links to parts and such already, I am trying to track down a repair manual.
    I thought a simple continuity test on the diode would see if it is working Y/N?

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  • Kitchen Ranges Master
  • 3,083 Answers

Depending on the serial number of your oven, it may be subject to a recall, as stated in the following website:
http://www.cpsc.gov/cpscpub/prerel/prhtml09/09046.html
The issue is with the self-cleaning function, and the heat from it is the problem. I would check with them first, explain your problem, and they may just agree to help you fix your unit.
It sounds, indeed, like the transformer output is bad, but the output needs to be isolated to ensure components in the output aren't pulling it down.
Capacitors are usually just replaced, if suspected, since they can break down under a load, but they can be tested fairly reliably.
Here is some information about TCOs:
http://forum.appliancepartspros.com/microwave-repair/48816-how-test-thermal-cut-out-sensors-tcos.html
Here is how to test the magnetron:
http://www.gallawa.com/microtech/mag_test.html
This page explains how to test the various components:
http://www.gallawa.com/microtech/mag_test.html
Since you're in a remote area, it would probably be difficut to obtain warranty work, but since you unit may be on the recall list, GE may just elect to help you out and replace it, and maybe they'll just authorize you to swap it out at Home Depot.
Anyway, hope this helps, and good luck in your quest to get it fixed.

Posted on Sep 04, 2010

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  • Master
  • 19,396 Answers

Hi.

I cannot see your other experts answers, but the fan has nothing to do with the problem.

If the oven does not heat, but turntable runs, then it is thermal cut off, high voltage diode , capacitor or magnetron.

TCO is easy to test, the tech will just read continuity (Ohms), diode and cap can only be tested with diode and capacitance tester tool. The last tool is integrated in expensive multimeters.
If the cap has continuity, then it must be replaced, as it is shorted, but often the cap is open and faulty. Capacitor must be discharged before testing, it can release heavy discharge.

If the microwave is working but not heating, then the magnetron is not necessariy the faulty part.
Before replacing the magnetron there is need to test the high voltage capacitor,the rectifier diode and the wiring. If all this are fine, then the control board muast also be checked.If turntable is not running check also the door switch.

The diode and capacitors can be tested using a tool with diode tester and cap meter. The capacitor must be allowed discharge before testing, or you risk to get electrocuted. Even if power is off a big electrolytic capacitor like the one on the MW can release a big discharge.Capacitors can get discharged by shorting their two contacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here:

Parts and diagrams for your model.

You can also find parts and specific diagrams for most models using the link below:

Where do I find parts and diagrams?


Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed after the oven is serviced or repaired.

If this helped, please do not forget to accept the solution. Each time a solution is passed to other expert we get a bad feedback that will bring down our stats, not counting the waste of time in assisting users to get a bad response.

Regards.

Ginko.

Posted on Sep 03, 2010

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  • Master
  • 8,220 Answers

Advantum
use this to diagnose

Posted on Sep 03, 2010

  • 1 more comment 
  • Dan Webster
    Dan Webster Sep 03, 2010

    I will have to look in my stash. One thing that I thought about was this: Do you have a posible blage of the fan like a buildup of lint and junk on that vent over the mag fan? If that is blocking the fan from cooling the mag then the limit on it will kill the heat. Take a look at this video

  • Dan Webster
    Dan Webster Sep 03, 2010

    Man I am sorry I have a bad keyboard. Beer spilled on it. A blocked vent over the fan will cause the magnetron to over heat. Grease and lint tend to build over the stove with time. Blocking the vent over the fan and this causes overheating of the magnetron.

  • Dan Webster
    Dan Webster Sep 03, 2010

    I do not have your manual you might can get a manual if you include the model number and ask my friends HERE


    Ge manuals are few and far between. When I would get cds from them they were always time sensitive. In order to keep the flow of info going they would send more CDs. I believe that is why you don't find many manuals on the internet. My opinion.

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